Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
The dimension of universal gravitational constant is……….?
\( M^{–1}L^3 T^{–2} \)
ML3T2
ML3
MLT-2
Correct answer is A
f α (MM ÷g2)
F(GMM ÷ r2) [G – gravitational constant]
GMM = Fr2
G = F02 ÷ MM = m × aπr2 ÷ MM (f = ma)
= (m × m5-2 × r2) ÷ MM
= (Kg.m52 × m2) ÷ Kg.Kg
=1 ÷ kg.m3.52
The dimension mathematically representation have a quantities of M, L AND T
M (Mass) = kg, L (Length) = M, T (Time) second
G = kg-1 m2.52(Using dimension rule)
M-1.L3.T-2
∴ The universal gravitational constant (G) =\( M^{–1}L^3 T^{–2} \)
For a best result using temperature to achieve an accurate measurement, it is best to use
Mercury thermometer
gas thermometer
clinical thermometer
alcohol thermometer
Correct answer is B
Gas thermometers are considered best for use to achieve an accurate temperature than others, such as liquid in glass thermometers such as mercury, clinical and alcohol thermometer
What is the S.I unit of relative density?
kg m-2
kg m2
kg cm3
has no S.I unit
Correct answer is D
Note: relative density has no S.I unit
∴ Relative density = weight of substance ÷ weight of equal volume of water
RD = w1 ÷ (w1 – w2) (no S. I unit)
If a projectile has maximum range of 36m, find the speed of projection (Take g = 9.8m/s2)
19m/s
2m/s
4m/s2
7m/s2
Correct answer is A
No explanation has been provided for this answer.
J.J. Thompson
James Chadwick
Michael faraday
Dalton
Correct answer is B
Neutron were discovered by James Chadwick in 1931